1/2 Qt in 3000 miles
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Join Date: Apr 2008
Location: Lee County, North Carolina
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I once knew someone who couldn't figure out why he was loosing oil (or so he thought) between each oil change. He told me his car needed 4.5 quarts to fill it up on the dipstick, and that he checked it after adding the oil and it was always full. But at the next oil change, sometimes sooner, it was about 1/2 quart low. He had no leaks and no burning oil that he could detect. I asked him if 4.5 was what it took to fill it up with a filter change or without a filter change. Answer turned out to be what I suspected. He actually needed to add 5 quarts with the filter change. He was adding 4.5 quarts, and then checking the oil as soon as he was done adding it (before running the vehicle). What he didn't realize was that after starting the car up, the new oil filter would fill up with oil, and his 4.5 quarts was no longer enough to show full on the dipstick.